view: handle case where map_ws is NULL
When a criteria places the view into the scratchpad, map_ws is NULL and
trying to access map_ws->fullscreen will result in SIGSEGFAULT with:
#0 0x0000000000455327 in should_focus (view=0x15a6a70) at ../sway/tree/view.c:604
prev_con = 0x0
len = <optimized out>
seat = 0x12233c0
prev_ws = 0x1264c80
map_ws = 0x0
criterias = <optimized out>
seat = <optimized out>
prev_con = <optimized out>
prev_ws = <optimized out>
map_ws = <optimized out>
criterias = <optimized out>
len = <optimized out>
num_children = <optimized out>
#1 view_map (view=view@entry=0x15a6a70, wlr_surface=0x15a5cb0, fullscreen=<optimized out>, fullscreen_output=<optimized out>, decoration=<optimized out>) at ../sway/tree/view.c:809
__PRETTY_FUNCTION__ = "view_map"
ws = <optimized out>
seat = <optimized out>
node = <optimized out>
target_sibling = <optimized out>
container = 0x1625400
set_focus = <optimized out>
app_id = <optimized out>
class = <optimized out>
#2 0x0000000000423a7e in handle_map (listener=0x15a6c78, data=<optimized out>) at ../sway/desktop/xdg_shell.c:454
xdg_shell_view = 0x15a6a70
view = 0x15a6a70
xdg_surface = 0x15a6620
csd = <optimized out>
#3 0x00007f508bd3674c in wlr_signal_emit_safe (signal=signal@entry=0x15a6718, data=data@entry=0x15a6620) at ../subprojects/wlroots/util/signal.c:29
pos = 0x15a6c78
l = 0x15a6c78
cursor = {link = {prev = 0x15a6c78, next = 0x7fff53d58190}, notify = 0x7f508bd366c0 <handle_noop>}
end = {link = {prev = 0x7fff53d58170, next = 0x15a6718}, notify = 0x7f508bd366c0 <handle_noop>}
#4 0x00007f508bd15b29 in handle_xdg_surface_commit (wlr_surface=<optimized out>) at ../subprojects/wlroots/types/xdg_shell/wlr_xdg_surface.c:384
surface = 0x15a6620
#5 0x00007f508bd2e981 in surface_commit_state (surface=surface@entry=0x15a5cb0, next=next@entry=0x15a5e18) at ../subprojects/wlroots/types/wlr_surface.c:455
__PRETTY_FUNCTION__ = "surface_commit_state"
invalid_buffer = <optimized out>
subsurface = 0x15a6038
#6 0x00007f508bd2f53b in surface_commit_pending (surface=0x15a5cb0) at ../subprojects/wlroots/types/wlr_surface.c:474
next_seq = 3
next_seq = <optimized out>
#7 surface_commit (client=<optimized out>, resource=<optimized out>) at ../subprojects/wlroots/types/wlr_surface.c:542
surface = 0x15a5cb0
subsurface = <optimized out>
If map_ws is NULL we assume the view is places into the scratchpad and
return false as well.
30e400c0a3